Help with a simple XMLTable query

Question

Newbie Oracle XML developer here and need a little guidance on how to retrieve multiple records in an xmltype table using xmltable.
My document in the xmltype table looks like this:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<echoems:ECHOMetrics xmlns:echoems="http://myURL/myFilename.xsd"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://myURL/myFilename.xsd
http://myURL/myFilename.xsd">
<OrderMetrics>
<OrderItemMetric>
<requestor>user1</requestor>
<product>123</product>
</OrderItemMetric>
<OrderItemMetric>
<requestor>0.0.0.0</requestor>
<product>ABC</product>
</OrderItemMetric>
<OrderItemMetric>
<requestor>user3</requestor>
<product>XYZ</product>
</OrderItemMetric>
</OrderMetrics>
</echoems:ECHOMetrics>
I want to get all the products:
Product
123
ABC
XYZ
I know to use XMLTable but am not sure how exactly to write it. If just one record, the following worked fine:
select extractvalue
(object_value,
'echoems:ECHOMetrics/OrderMetrics/OrderItemMetric/product',
'xmlns:echoems="http://myURL/myFilename.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"'
) object_value
from echoXML;
But with multiple records, I'm trying XMLTable but can't get it right. Trying something like this:
select m.product
from echoXML3
xmlTable(
(object_value,'echoems:ECHOMetrics/OrderMetrics/OrderItemMetric/*','xmlns:echoems="http://myURL/myFilename.xsd')
passing object_value
COLUMNS
product varchar2(85) path 'product') m;
Thanks in advance for any help on this.

Answer 1

One more question. Instead of putting the xml doc in the query, how do I reference it from the xmlType table?
You have:
select *
from xmltable
'//OrderMetrics/OrderItemMetric'
passing xmltype(
'<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<echoems:ECHOMetrics xmlns:echoems="http://myURL/myFilename.xsd"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://myURL/myFilename.xsd">
<OrderMetrics>
<OrderItemMetric>
<requestor>user1</requestor>
<product>123</product>
</OrderItemMetric>
<OrderItemMetric>
<requestor>0.0.0.0</requestor>
<product>ABC</product>
</OrderItemMetric>
<OrderItemMetric>
<requestor>user3</requestor>
<product>XYZ</product>
</OrderItemMetric>
</OrderMetrics>
</echoems:ECHOMetrics>')
columns
prod varchar2(20) path 'product',
requestor varchar(50) path 'requestor'
However, the xmlDocument is already in an xmlType table called echoXML3 based on the xsd. I'm just trying to query it to get a relational result set. How, in the query above, do I replace the hardcoded xmlDoc with the xmlDoc located in my xmlType table?
I thought maybe something like this but it's not working:
select *
from xmltable
'//OrderMetrics/OrderItemMetric'
passing xmltype(select value(e)
from echoXML3,
TABLE(xmlsequence(extract(object_value,'echoems:ECHOMetrics/OrderMetrics/OrderItemMetric/*','xmlns:echoems="http://myURL/myFilename.xsd'))) e)
columns
prod varchar2(20) path 'product',
requestor varchar(50) path 'requestor'
Message was edited by:
user619814